Drill machine table

ABSTRACT

A drilling machine for a mobile drilling appliance which includes a housing which is adapted to travel along a jobber, a drive motor mounted on said housing, a pinion operatively connected to said drive motor, a step-down gear rotatably engaging said pinion, a driving socket located in the vicinity of a side face of said housing that contains a central opening which is adapted to receive a driving shaft that in turn is adapted to be connected to a drilling tool, and a driving ring positioned in said driving socket and engageable with said step-down gear.

The invention relates to a drilling machine table for a mobile drillingappliance.

BACKGROUND

Drilling machine tables of this type are used in known mobile drillingappliances and serve for example for drilling holes in pile foundations.

Sometimes it would be desirable to produce a drill hole also in theimmediate vicinity of an already existing building. This is not possiblewith the known drilling machine tables, since the stepping-down gear hasa large diameter, so that then if the drilling machine table is movedclose up to a building wall, the drilling axis is at a greater distancefrom this wall.

SUMMARY OF THE INVENTION

A drilling machine table according to the present invention provide thateven drill holes in the immediate vicinity of a building wall can bedrilled.

The development of the invention according to one embodiment has anadvantage with regard to a simple and exact movement of the drillingtool up to a drilling point located in the immediate vicinity of abuilding wall, using an excavator supporting the jobber.

The development of the invention according to another embodiment makesit possible to provide drilling machine tables which are already in use,additionally with a driving socket lying close to the edges of thedrilling machine table or to produce conventional drilling machinetables and drilling machine tables according to the invention largelyusing identical standard components.

The development of the invention according to another embodiment has anadvantage with regard to the simplest possible subsequent equipping ofalready existing drilling machine tables. The offtake of the drivingmovement for the driving socket located at the edge of the drillingmachine table from the rotary movement of the step-down gear takes placewithout any intervention in the interior of the existing conventionaldrilling machine table; only a few simple add-on parts are used.

With compact dimensions of the power-transmission device, thedevelopment of the invention according to another embodiment facilitatesa 1:1-translation between the step-down gear and driving socket, i.e. arotating driving socket with the same speed as the step-down gear. Onethus has comparable driving ratios for both power take off points of thedrilling machine table.

Also the development of the invention according to another embodimentserves for simple subsequent provision of the invention on alreadyexisting drilling machine tables without appreciable intervention in themechanics of the drilling machine table. In this variation, one can alsoeasily provide an increased speed with respect to the normal drive, atthe additional power take off point close to the edge.

According to another embodiment, one obtains a drilling machine table,in which the housing projects only slightly beyond the drilling axis inone direction, so that drill holes can be produced in the immediatevicinity of a building wall, with overall particularly compactdimensions of the housing in the direction perpendicular to the drillingaxis (in the case of normal use this corresponds to the direction oftravel of the chassis).

BRIEF DESCRIPTION OF DRAWINGS

The invention will be described in detail hereafter by means ofembodiments, referring to the drawings, in which:

FIG. 1 is a vertical axial section through a drilling machine table withan additional driving socket close to the edge for a drilling tool;

FIG. 2 is a similar view to FIG. 1, in which a modified drilling machinetable is illustrated; and

FIG. 3 is a sectional view similar to FIG. 1, in which a drillingmachine table which has again been modified is shown.

PREFERRED EMBODIMENTS

In FIG. 1, a drilling machine table is designated generally by thereference numeral 10, which is able to travel in the vertical directionon a jobber 12 shown in broken line, for example using a rope winch or ahydraulic cylinder (not shown in detail).

The drilling machine table 10 has a main lower housing part 16 and amain upper housing part 14 as well as a divided add-on housing part 18fitted on the end faces of the main housing parts on the right inFIG. 1. The housing parts 14 to 18 are detachably connected to eachother in a manner which is not shown in detail, for example by screws.

Attached to the side face of the main lower housing part 16 located atthe front in FIG. 1 is a guide rail 20 having an I-shaped cross-section.Similarly, a second guide rail is fixed to the rear side face of thelower housing part 16. The guide rails 20 cooperate with the side facesof the jobber 12 and thus form the guide for the drilling machine table10.

A hydraulic drive motor 22 is located on the upper side of the upperhousing part 14, the shaft 24 of which motor supports a pinion 26.Bearings 28, 30 serve for mounting the shaft 24 in the drilling machinetable housing.

The pinion 26 acts on a step-down gear 32 having a large diametercompared therewith, which gear has integrally formed stub shafts 34.Bearings 36, 38 serve for mounting the step-down gear 32 in the drillingmachine table housing.

The step-down gear 32 has a central passage 40 with a squarecross-section for receiving a corresponding square drive shaft for adrilling tool. Openings 42, 44 are provided in the main lower housingpart 16 and in the main upper housing part 14 above and below thepassage 40.

A driving socket 50 is mounted by way of bearings 46, 48 inside theadd-on housing part 18. This driving socket 50 has a central opening 52with the same square cross-section as the passage 40. Integrally formedon the driving socket 50 is a toothed ring 54, which meshes with thestep-down gear 32. Compared with the diameter of the step-down gear 32,the toothed ring 54 has a small diameter, so that the axis of thedriving socket 50 lies close to the edge of the drilling machine table10 on the right in FIG. 1.

In FIG. 1, a square driving shaft 56 is shown in broken lines, whichpasses through the opening 52 with axial sliding clearance. A drill 60is attached by way of a coupling 58 at the lower end of the drivingshaft 56.

As can be seen from FIG. 1, the drill 60 can be rotated into the earthdirectly in front of a building wall, without the drilling machine tablehousing striking against the building wall.

However, the drilling machine table 10 illustrated in FIG. 1 may alsooperate as a conventional drilling machine table: for this purpose oneneeds to introduce solely one driving shaft 56 into the passage 40 ofthe step-down gear 32.

If, in the drilling machine table illustrated in FIG. 1, the add-onhousing part 18 and the driving socket 50 are omitted and the mainhousing parts 14, 16 are closed at the right-hand end by a plate, thenone acquires a conventional drilling machine table. Thus with largelystandardised components, one can construct both drilling machine tableswith an additional driving shaft holder close to the edge as well asconventional drilling machine tables.

Conversely it will be seen that when one opens the drilling machinetable housing of a conventional drilling machine table at the end facelocated on the right in FIG. 1, by simply attaching the add-on housingpart 18 with the driving socket 50 mounted therein, one creates thepossibility of a power take off point close to the edge for the drivingmovement of the drill.

The construction illustrated in FIG. 1 also has the advantage thatdriving movements of the drill at different speeds are provided in amechanically very simple manner.

FIG. 2 shows a modified drilling machine table, in which the power takeoff point close to the edge rotates at the same speed and with the samedirection of rotation as the power take off point of the conventionaldrilling machine table. Components which have already been explainedwith reference to FIG. 1, are again provided with the same referencenumeral and will not be described again in detail.

At its upper end guided out beyond the add-on housing part 18', thedriving socket 50' supports a chain wheel 66. The latter is driven by achain 64 shown solely diagrammatically in broken line, which travelsover a driving chain wheel 62. The latter is seated at the upper end ofa drive part designated generally by the reference numeral 68. This hasa square coupling section 70, which fits in a form-locking manner in thesquare passage 40' of the step-down gear 32', as well as a cylindricalcollar 72, by which the driving part 68 is seated on the upper side ofthe step-down gear 32'. The driving part 68 is undetachably connected tothe step-down gear 32' by a washer 74 engaging on the under side of themain lower housing part 14' and a splint 76.

A sheet metal cover 78 surrounds the chain drive, the step-down gear 32'and drive socket 50' for the synchronous rotary movement.

In the variation illustrated in FIG. 2, for the subsequent provision ofthe power take off point close to the edge, one requires no mechanicalinterventions in a conventional drilling machine table. One needs solelyto screw the add-on housing part 18' onto the main housing, to insertthe driving part 68 in the step-down gear 32' and to place the chain 64over the chain wheels 62 and 66.

The modified drilling machine table illustrated in FIG. 3 (whereincomponents already shown and described relative to FIG. 1 are identifiedwith the same numeral or the same numeral with two added apostrophes).is characterised by particularly small dimensions in the horizontaldirection. This is possible due to the fact that the reduction gear 32"is allowed to rotate in a vertical plane adjacent to the guide rails20". In the embodiment according to FIG. 3, components corresponding tocomponents already described above as regards their function are againprovided with the same reference numeral or the same numeral with asingle added apostrophe.

The stub shaft 34" extending towards the right away from the step-downgear 32" in FIG. 3 supports a bevel gear 80 on its right-hand end andthe latter meshes with the toothed ring 54" of the driving socket 50",constructed in a corresponding bevelled manner.

The embodiment according to FIG. 3 originally offers a power take offpoint close to the edge for the drill driving movement. It ischaracterised by a particularly compact construction with only a fewmechanical parts and is therefore preferred for the new construction ofdrilling machine tables, whereas the embodiments according to FIGS. 1and 2 are preferably used in the subsequent equipping of alreadyexisting drilling machine tables.

As a modification of the embodiment illustrated in FIG. 3, one can alsolocate the drive motor 22" on the upper side of the main upper housingpart 14", so that the shaft 24" once more rotates about a vertical axis.The pinion 26" is then constructed as a bevel pinion, the externaltoothing of the step-down gear 32" is then bevelled in a correspondingmanner. This makes it possible to shorten the stub shaft 34" supportingthe bevel gear 80, due to which the axis of the driving socket 50" canbe placed even closer to the jobber 12".

We claim:
 1. A drilling machine for a mobile drilling appliance whichcomprises in combination(a) a housing (14, 16, 18) which is slidablymounted to a jobber (12), (b) a drive motor (22) mounted on a part ofsaid housing, (c) a pinion (26) operatively connected to said drivemotor (22), (d) a step-down gear (32) rotatably engaging said pinion(26), the diameter of said step-down gear (32) being large in comparisonwith the diameter of said pinion (26), (e) a driving socket (50) locatedin the vicinity of a side face of said housing (18), said socket (50)containing a central non-circular opening (52) receiving in an axiallydisplaceable manner, a driving shaft (56) that in turn is connected to adrilling tool (60), and (f) a driving ring (54) positioned in saiddriving socket (50) around said opening (52) and engageable with saidstep-down gear (32), the diameter of said driving ring (54) being smallin comparison with the diameter of the surface of said step-down gear(32) that engages said pinion (26).
 2. A drilling machine according toclaim 1 wherein one side face of said housing (14, 16) is provided withguide means (20) cooperating with the jobber (12).
 3. A drilling machinetable according to claim 2 wherein said step-down gear rotates in avertical plane adjacent to the guide means and meshes by way of a smallbevel gear with said driving ring, said driving ring being constructedas a bevel gear.
 4. A drilling machine according to claim 1 wherein saidhousing includes a main housing section (14, 16) and an add-on housingsection (18) attached to and extending outwardly from a side face ofsaid main housing section (14, 16).
 5. A drilling machine according toclaim 4 wherein said step-down gear (32) is mounted in said main housingsection (14, 16).
 6. A drilling machine according to claim 5 whereinsaid driving socket (50) is mounted in said add-on housing (18).
 7. Adrilling machine table according to claim 1 wherein said step-down gear(32) has a central, non-circular passage (40) receiving in an axiallydisplaceable manner, a correspondingly non-circular driving shaft, saiddriving ring (54) as well as said pinion (26) meshing with saidstep-down gear (32).
 8. A drilling machine table according to claim 1wherein said step-down gear has a central, non-circular passagereceiving a drive part that includes a driving chain wheel, said drivingsocket includes a driven chain wheel, and a chain operatively connectsthe driving chain wheel with the driven chain wheel.